Crown stripper



July 2l, 1925.

1,546,355 A. ANDERSON CROWN STRIPPER Orizinal. Filed Nov. 8, 1922 UNI-TED STATES PATENT oFFIcE..

I ANTON ANDERSON, OF NEV HAVEN, CONNECTICUT.

CROVJN STRIPPER.

Application filed November S, 1922, Serial No. 599,717. Renewed January 12, 1925.

To ZZ to/om t may Conce/fn:

13e it known that l, Auron ANDnnsoN, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful improvements in Crown Strippers, of which the following is a specification, reference being had therein to the accompanying drawings.

This invent-ion relates to a crown stripper and it is the objectthereof, among other things, to provide a simple and eifectiv tool that will remove a cro-wn from a tooth with the minimum labor and without pain to the patient.

To these and other ends my invention consists in the crown stripper having certain details of construction and combinations of parts as will be hereinafter described and more particularly pointed out in the claim.

Referring to the drawings in which like numerals of reference designate like parts in the several figures:

Figure 1 is an elevation of my improved crown stripper;

Figure 2 isv a fragn'ientary elevation thereof looking toward the right of Figure 1; and

Figure I5 is a fragmentary elevation, the parts in section being taken generally upon line 8 3 of Figure 2.

ln the practice of my invention l provide a pair of elongated jaws 10 and 11 of the ordina-ry parallel jaw pliers 12. At the outer end of the jaw 10 is a plate 13 of greater area than the end of the jaw and projects beyond the end and side thereof. This plate may be integral with the jaw or secured there-to as may seem most desirable. Tae outer end of the jaw 11 is provided with an opening 14 through wl 'ch projects the shank 15 of a cutter' 1G, which is held against displacement therein by a screw 17, or the like.

Projecting from the head of this cutter a blade 18, which may be arranged for operation in any one of a number of radial positions about the axis of the shank 15 and there held against movement. The means shown for producing this result consists in forming the end 21 of the shank 15 with a plurality of angular faces, these being shown as eight in number, which project through an opening 19 in the outer end of a plate 20 fastened to the jaw 11.

To vary the radial position of the blade the end of the plate 20 is lifted so as to be out of engagement with the shank 15 and then the latter with the attached cutter' is moved to its desired position, when the plate is again released, which again engages and holds the shank against rotary movement.y

in practice, the stripper is placed with the plate 13 against the under side of the crown and the jaws opened a sullicient distance to permit the under side of the blade 18 to engage the top of the crown. rEhen by moving the handles of the tool together as in the ordinary pliers, the blade passes down through the wall of the crown and opens the same so that it may be readily and painlessly removed from the tooth.

By means of the adjustment of the cutter within the jaw 11, the blade can be placed in positions to operate upon any tooth, without pain or inconvenience to the patient, whether in the upper or lower jaw.

Hthin the scope of the appended claim changes and alterations may be made within my invention, aside from those herein suggested and l would therefore have it understood that I do not limit myself to the exact construction herein shown and described.

WV hat I claim as new and desire to secure by Letters Patent, is:

In a device of the character described having jaws that move parallel to each other, one of said jaws having an opening therethrough near the end thereof at substantially a right angle to the path of movement of the jaw; cutting` means, comprising al blade having a cylindrical shank upon one side thereof atsubstantially a right angle thereto, the outer end of which is angular in cross section, said blade being arranged so that the cutting portion thereof projects beyond the end of the jaw and parallel therewith; means connected with said jaw to prevent accidental endwise movement of the said shank; a spring plate connected With said jaw having an opening therenected with the other of said jaws opposite through of substantially the same shape in t0 said blade and of sufficient size to furnish Cross section as that 01"' the angular end of a pressure surface opposite to said blade in l0 said shank and by the engagement of which any 0f it adjusted POStO-IIS.

5 said blade is held against accidental movev- III t6SJ1I1f1-0Ily WheleOf, I have heleUDO ment in any of its radial positions about affixed my Slgltu the axis of said shank; and a flat plate con- ANTON ANDERSON. 

